the documentation has a new chapter about system installation on harddisk and configuration of a multiboot setup.

Emulation

You can run the CD image in an emulator using the -cdrom image_name.iso parameter.
The minimal system requirements to start the XO-LiveCD without modifications
(you may press F1 in the boot screen to read more) is 512 MB of RAM.
So a command to load the CD image in QEMU is, roughly,